Noninvasive diagnosis of coronary artery disease in patients with heart failure and systolic dysfunction of uncertain etiology, using late gadolinium-enhanced cardiovascular magnetic resonance

OBJECTIVES We evaluated the feasibility of using late gadolinium-enhanced (LGE) cardiovascular magnetic resonance (CMR) to distinguish left ventricular (LV) systolic dysfunction related or not to coronary artery disease (CAD) in patients with heart failure (HF) but without clinical suspicion of CAD as the underlying cause. BACKGROUND In patients with known CAD, LGE-CMR is capable of distinguishing LV systolic dysfunction related to CAD from dilated cardiomyopathy. METHODS Seventy-one patients with HF and LV systolic dysfunction, without a previous history of myocardial infarction, with neither Q waves nor clinical data suggesting CAD, underwent both LGE-CMR and coronary angiography. RESULTS Twenty-six patients (37%) had angiographically proven CAD (greater than or equal to 70% stenosis of a major epicardial vessel) (angio, [+] group), and 45 (63%) had unobstructed coronary arteries (angio [-] group). Twenty-one patients in the angio (+) group (21 of 26, 81%) showed subendocardial and/or transmural enhancement, whereas only 4 (9%) of 45 in the angio (-) group showed it (p < 0.001). In 7 patients (7 of 71, 10%), we found a diffierent pattern of mid-wall enhancement - namely, 3 of 26 patients in the angio, (+) group and 4 of 45 in the angio (-) group (11% vs. 9%, p = 0.7). Mid-wall enhancement in the angio, (+) group was distributed in segments other than those which had subendocardial enhancement. CONCLUSIONS In patients with HF and LV systolic dysfunction without clinical suspicion of CAD, LGE-CMR is an excellent tool for classifying patients in relation to the presence or absence of underlying CAD. Thus, CMR might offer a valid alternative to coronary angiography for the detection of CAD in these patients. (C) 2005 by the American College of Cardiology Foundation.